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FNUS75 KBOI 250121

FWSBOI



Spot Forecast for Mill Creek RX...Forest Service

National Weather Service Boise ID

721 PM MDT Wed Apr 24 2024



Forecast is based on ignition time of 1000 MDT on April 25. 

If conditions become unrepresentative...contact the National Weather

Service.



...DRY COLD FRONTAL PASSAGE LATE TONIGHT...

...SHOWERS LIKELY THURSDAY NIGHT...



.DISCUSSION...

Dry conditions tonight with a cold frontal passage expected around 10 PM.

This will keep the wind primarily out of the north-northwest overnight.

Thursday will be dry ahead of another frontal passage with higher 

chances of precipitation during the evening. Minimum relative humidities 

will hover around 35-45% in the afternoon which will increase rapidly 

as the front approaches. The front and showers are expected to reach 

the burn site between 8 PM and 10 PM. Precipitation could last well into

Friday morning. Breezy northwesterly winds will follow for Friday afternoon.

Showers area also possible though low confidence the burn site will see 

any measurable rainfall.  

 



.THURSDAY...



Sky/weather.........Mostly sunny.

Max temperature.....58 to 66. 

Min humidity........37 to 42 percent. 

CWR /0.10 inch/.....0 percent. 

LAL.................1. 

Wind - eye level....Northwest around 6 mph in the morning, shifting 

                    to southwest 5 to 7 mph in the afternoon. 

Mixing height.......6500 ft AGL. 

Transport winds.....Southwest around 10 mph. 

Haines Index........2 very low. 

Ventilation index...650 good. 



.THURSDAY NIGHT...



Sky/weather.........Rain showers likely in the evening, then rain 

                    showers after midnight. Chance of showers 80 

                    percent. 

Min temperature.....41 to 46. 

Max humidity........90 to 100 percent. 

CWR /0.10 inch/.....50 percent. 

LAL.................1. 

Wind - eye level....Southwest up to 5 mph in the evening, shifting 

                    to northwest up to 5 mph after midnight. 

Mixing height.......700 ft AGL. 

Transport winds.....West around 5 mph. 

Haines Index........2 very low. 

Ventilation index...35 poor. 



.FRIDAY...



Sky/weather.........Rain likely in the morning, then a chance of 

                    rain showers and a slight chance of 

                    thunderstorms in the afternoon. Chance of 

                    precipitation 80 percent. 

Max temperature.....52 to 59. 

Min humidity........55 to 60 percent. 

CWR /0.10 inch/.....50 percent. 

LAL.................1 in the morning, increasing to 2 in the 

                    afternoon. 

Wind - eye level....Northwest up to 10 mph with gusts up to 20 MPH. 

Mixing height.......4500 ft AGL. 

Transport winds.....Northwest around 10 mph. 

Haines Index........3 very low. 

Ventilation index...450 fair. 



$$

Forecaster...Smith

Requested by...Ray Bilbao

Type of request...PRESCRIBED

.TAG 2412380.0/BOI

.DELDT 04/25/24

.FormatterVersion 2.0.0

.EMAIL ray.bilbao@usda.gov